Insole for footwear



FIG. 1 is a lower perspective view of an insole for footwear embodying our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is an right side view thereof; and,

FIG. 6 is a left side view thereof.

The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an insole for footwear, as shown and described. 